Created attachment 177884 [details]
Screen recording of the bug

SUMMARY
Opening properties of a file / folder for the first time in dolphin under X11 messes up window management badly.
The dolphin window is hidden for a short time, then re-appears at a different position, along with the properties dialogue.

STEPS TO REPRODUCE
1. Open a fresh instance of dolphin in X11 (maybe also Wayland, untested)
2. Right click a folder or file
3. Click on properties

OBSERVED RESULT
Dolphin window unaffected, dialogue window opens

EXPECTED RESULT
A whole lot of mess (see attached video)

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 41
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.12.11-200.fc41.x86_64 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 7700X 8-Core Processor
Memory: 31.1 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4080/PCIe/SSE2
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7D70
System Version: 1.0

ADDITIONAL INFORMATION
Unfortunately the whole thing happens way too fast so I couldn't get any decent x properties info or the likes.
Neither kwin nor dolphin give any helpful output on stdout or stderr  (except some potentially unrelated qml warnings).
Window manager is kwin, mostly default settings, no window rules for dolphin as far as I can spot. 
Reproducible on my laptop (same software versions) with an Intel GPU, thus unrelated to graphics stack or drivers.